Chemical vapor deposition of thoriated tungsten protective cups Page: 39 of 45
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A unique manufacturing process was developed for chemically vapor co-depositing
tungsten-2 percent thoria protective cups by use of an all gaseous system.
It appeared that the thoria was present as a super fine dispersion within the tungsten
grains as manifest by the resistance of the material to grain growth and property degradation
at elevated temperatures, similar to that observed for Westinghouse W-Special alloy.
Preparation of a molybdenum male mandrel made precisely to the cup's inside
dimensional and surface finish requirements results in cups with as-deposited inside surfaces
conforming exactly to the outside dimensions of the mandrel. No machining, blending, or
hand polishing of the inside surfaces of the cups was required. This eliminates one of the more
difficult operations in fabricating tungsten materials; even threads may be precisely deposited.
Purchasing Department Specification 30103 was written at the conclusion of this
program for defining the process and controlling the quality of CVD tungsten-2 percent thoria
protective cups. See Appendix A.
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Blay, J.S. Chemical vapor deposition of thoriated tungsten protective cups, report, January 1, 1968; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1026564/m1/39/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.